Theme: The food chain. All living things try hard to survive but the relationship between each of them is just "to eat" or "be eaten". It sounds a bit merciless, while it shows dynamic vitality.
Conflict: Octopuses vs. other animals which try to eat them.
Setting: This story is set in present-day Greece. We can see many beautiful houses which are painted all white; it is characteristic of the Mediterranean style architecture. Also the title is written in Greek. The man is driving a car, therefore the story is set in the present day.
Character: The main character are two octopuses; the orange one (male, I guess) and the pink one (female). Others are two enemies. The man who intends to sell the pink one and the seagull which takes away the orange one at the end of the story.
Climax: The climax is the very last part. As orange octopus is taken away by the seagull. Once we are relieved that they can escape from the man, though, unexpected enemy appears right away. It surprises us very much indeed.
Irony: I think there are two points. First, people's defeat in the story. Generally humans are regarded as the top of the food chain. So it is incredible that two octopuses overcome a man. Moreover, he finally falls into the sea where octopuses inhabit; it is completely reversal.
Second, the uncertainty of two octopuses' life. This story ends with the scene that seagull picks one of them up and fly away. Although they won the man, more closer enemy threatens their life soon after. We cannot expect the ending; they may survive or not. Thus it relates to the irony.